Does it even really matter that much what Unwinder does? Not to spur on any flaming or whatnot, but you have to think about this realistically.

The demand for a gui based voltage tuner is obviously high amongst enthusiasts. So one would have to reason that
someone will make such a tool or mod. Unwinder has said he doesn't want to, and nothing we do will change that.

Let it be, and give it some time. I'm sure you'll have a program that suits your liking sometime relatively soon.